Pollution

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Certain actions and building operations produce changes in the local environment which, although invisible to the eye, may affect the growth of Flax and other crops as well as wood collection. The Ecology skill is used to test for pollution in a location.

Pollution is not well understood; see below for discussion on what does and does not appear to cause it. However, based on what may be tested using the Ecology skill, we can assume that there are eight environmental categories where pollution can occur:

• Heavy metal pollution
• Soil acidity
• Groundwater level
• Phosphorus level
• Soot level
• Nitrogen level
• Potassium level
• Salinity

Tests

around modern sheep farms/thistle gardens at 1563, 1958

other buildings nearby: silkworm farms, beetle terrariums, khefre's locker, papy tanks and rabbit hutches

• Acid 6667
• soot 5
• nitrogen 190
• potassium untested
• all other levels normal

Soot and nitrogen seemed to center around the sheep farms/thistle gardens acid was a rather large blob and couldn't pinpoint its center. a peresphone furnace nearby had higher level acidity, but it dropped off closer to the furnace then the sheep farms/thistle gardens

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I tested near a well-used firepit. Levels for Ecology 1-5 were normal (I do not have Ecology 6). Flax grew normally. Peppers did not grow at all, but the further away the better they grew. Cabbage, interestingly, produced normal produce and 4 seeds instead of the 1 it produced a distance from the firepit. This was tested with Sissue #1 and Eigam #1.

Nitrogen

Flax and Vegetable production is sensitive to varying Nitrogen (N) levels. Baseline Nitrogen is 100. I have measured levels ranging from 72 to 341 at various times and locations. There appear to be three sensitivity levels associated with flax/veggie production.

• Low Nitrogen: N <= 91
• Normal Nitrogen: 92 <= N <= 108
• High Nitrogen: N >= 109

I have done extensive testing of flax production under N values between 82 and 128. Of the 8 original flaxes only Old Egypt and Nile Green are not sensitive to Low or High N. Constitution Peak is sensitive to Low N but not sensitive to High N. The other five strains are not productive under either Low or High N. Several of my crossbreed strains are productive under High N but not Low N. A few are productive under all N levels I have tested them on.

This does not exclude other pollution types being factors in poor flax/veggie production

(DonQuiHotep - 2 Feb 2016)

Based on subsequent testing the Normal Nitrogen range has been adjusted. 92 instead of 91 is the lower boundary. I have assumed that the upper level adjustment will be the same. DonQuiHotep 14:42, 30 July 2016 (EST)

(Lyo - 5 Oct 2016)

I've been seeing spiking high levels of nitrogen in my CP, and by process of elimination have reduced it to chickens.

I was finding the nitrogen level to be, from a high of around 130 (cause unknown) going down by about 3 every 12 hours. While it was dropping I noticed no effect from camels, sheep, chemistry activities, charcoal making, papy planting and harvesting, fleet furnace. However, when I put chickens (5 hens, 1 rooster) back into the coop (I had taken them out at the beginning of the process) the nitrogen level was back to 130 9 hours later. They had not produced any eggs during that time.

Phosphorus

Phosphorous levels at 120 and above reduces flax productivity, for both normal and rotten flax. Low output flaxes may produce nothing. Higher output flaxes have lower than normal output. (DonQuiHotep - 13 Apr 2016)

Soot

Elevated soot levels affect flax productivity similart to Elevated Phosphorous levels. More thorough research is needed to determine soot numbers and productivity changes. (DonQuiHotep 15 May 2016)

At soot = 12, no standard flax seed produces any flax. Ariella #376, Tedra #264 and DonQuiHotep#287 also did not produce output. Cabbage, Carrots, Cucumbers and Peppers all produce 7 vegetables instead of the expected output of 9 or 10 vegetables. Seed production appears unaffected by soot. DonQuiHotep 09:51, 16 June 2016 (EST)

Buildings that we suspect cause pollution

• According to preliminary tests printing presses seem to cause high acidity (2001 measured) in the soil in a radius of 35 coords. After 12RL hours (maybe less) acid levels decreased to 1001. Peer review on this would be welcome.